RFICDUDE
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For single carrier channels (UMTS uplink, GSM, EDGE CDMA reverse link, etc.) the image is just the signal itself, but the is not necessarily the same signal in multicarrier systems (UMTS downlink, CDMA forward link, WLAN, LTE, WiMAX, etc.). Multicarrier systems generally will have unique subcarriers or channels at the image. In these cases the ZIF demodulator is still providing two real signals, I and Q, that the modem uses to separate out the upper and lower sideband carriers and/or channels.
ZIF is just as beneficial (reduced parts count and power) for OFDM and multicarrier systems as it is for single carrier systems.
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